611151561 has 48 divisors (see below), whose sum is σ = 977872896. Its totient is φ = 380506896.

The previous prime is 611151551. The next prime is 611151571. The reversal of 611151561 is 165151116.

It is an interprime number because it is at equal distance from previous prime (611151551) and next prime (611151571).

It is not a de Polignac number, because 611151561 - 2⁵ = 611151529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (611151551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 239056 + ... + 241598.

It is an arithmetic number, because the mean of its divisors is an integer number (20372352).

Almost surely, 2^611151561 is an apocalyptic number.

It is an amenable number.

611151561 is a deficient number, since it is larger than the sum of its proper divisors (366721335).

611151561 is a wasteful number, since it uses less digits than its factorization.

611151561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624 (or 2612 counting only the distinct ones).

The product of its digits is 900, while the sum is 27.

The square root of 611151561 is about 24721.4797494001. The cubic root of 611151561 is about 848.6259511734.

The spelling of 611151561 in words is "six hundred eleven million, one hundred fifty-one thousand, five hundred sixty-one".