1961166531 has 16 divisors (see below), whose sum is σ = 2687640480. Its totient is φ = 1271550720.

The previous prime is 1961166523. The next prime is 1961166533. The reversal of 1961166531 is 1356611691.

It is not a de Polignac number, because 1961166531 - 2³ = 1961166523 is a prime.

It is a super-2 number, since 2×1961166531² = 7692348324629147922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1961166531.

It is not an unprimeable number, because it can be changed into a prime (1961166533) 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, 43920 + ... + 76493.

It is an arithmetic number, because the mean of its divisors is an integer number (167977530).

Almost surely, 2^1961166531 is an apocalyptic number.

1961166531 is a deficient number, since it is larger than the sum of its proper divisors (726473949).

1961166531 is a wasteful number, since it uses less digits than its factorization.

1961166531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120566.

The product of its digits is 29160, while the sum is 39.

The square root of 1961166531 is about 44285.0599073773. The cubic root of 1961166531 is about 1251.7131775588.

The spelling of 1961166531 in words is "one billion, nine hundred sixty-one million, one hundred sixty-six thousand, five hundred thirty-one".