1201544641 has 12 divisors (see below), whose sum is σ = 1321820500. Its totient is φ = 1091391840.

The previous prime is 1201544579. The next prime is 1201544651. The reversal of 1201544641 is 1464451021.

It can be written as a sum of positive squares in 2 ways, for example, as 541260225 + 660284416 = 23265^2 + 25696^2 .

It is not a de Polignac number, because 1201544641 - 2⁹ = 1201544129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201544651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169435 + ... + 176383.

Almost surely, 2^1201544641 is an apocalyptic number.

1201544641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201544641 is a deficient number, since it is larger than the sum of its proper divisors (120275859).

1201544641 is a wasteful number, since it uses less digits than its factorization.

1201544641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400 (or 8389 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1201544641 is about 34663.3039538934. The cubic root of 1201544641 is about 1063.1143253539.

Adding to 1201544641 its reverse (1464451021), we get a palindrome (2665995662).

The spelling of 1201544641 in words is "one billion, two hundred one million, five hundred forty-four thousand, six hundred forty-one".