1331272251 has 6 divisors (see below), whose sum is σ = 1922948820. Its totient is φ = 887514828.

The previous prime is 1331272211. The next prime is 1331272253. The reversal of 1331272251 is 1522721331.

It is not a de Polignac number, because 1331272251 - 2¹³ = 1331264059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331272253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73959561 + ... + 73959578.

It is an arithmetic number, because the mean of its divisors is an integer number (320491470).

Almost surely, 2^1331272251 is an apocalyptic number.

1331272251 is a deficient number, since it is larger than the sum of its proper divisors (591676569).

1331272251 is a wasteful number, since it uses less digits than its factorization.

1331272251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147919145 (or 147919142 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 1331272251 is about 36486.6037197216. The cubic root of 1331272251 is about 1100.0749951624.

Adding to 1331272251 its reverse (1522721331), we get a palindrome (2853993582).

It can be divided in two parts, 133 and 1272251, that added together give a square (1272384 = 1128²).

The spelling of 1331272251 in words is "one billion, three hundred thirty-one million, two hundred seventy-two thousand, two hundred fifty-one".