1210671561 has 16 divisors (see below), whose sum is σ = 1808572608. Its totient is φ = 713908800.

The previous prime is 1210671559. The next prime is 1210671571. The reversal of 1210671561 is 1651760121.

It is not a de Polignac number, because 1210671561 - 2¹ = 1210671559 is a prime.

It is a super-2 number, since 2×1210671561² = 2931451257228353442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1210671521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494550 + ... + 496991.

It is an arithmetic number, because the mean of its divisors is an integer number (113035788).

Almost surely, 2^1210671561 is an apocalyptic number.

1210671561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210671561 is a deficient number, since it is larger than the sum of its proper divisors (597901047).

1210671561 is a wasteful number, since it uses less digits than its factorization.

1210671561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991592.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1210671561 is about 34794.7059335181. The cubic root of 1210671561 is about 1065.7993399493.

The spelling of 1210671561 in words is "one billion, two hundred ten million, six hundred seventy-one thousand, five hundred sixty-one".