616961961 has 64 divisors (see below), whose sum is σ = 1147023360. Its totient is φ = 318401280.

The previous prime is 616961957. The next prime is 616961971. The reversal of 616961961 is 169169616.

It is not a de Polignac number, because 616961961 - 2² = 616961957 is a prime.

It is a super-2 number, since 2×616961961² = 761284122641931042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (616961911) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 346305 + ... + 348081.

It is an arithmetic number, because the mean of its divisors is an integer number (17922240).

Almost surely, 2^616961961 is an apocalyptic number.

It is an amenable number.

616961961 is a deficient number, since it is larger than the sum of its proper divisors (530061399).

616961961 is a wasteful number, since it uses less digits than its factorization.

616961961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971 (or 1965 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 616961961 is about 24838.7189887079. The cubic root of 616961961 is about 851.3068529243.

The spelling of 616961961 in words is "six hundred sixteen million, nine hundred sixty-one thousand, nine hundred sixty-one".