611665531 has 2 divisors, whose sum is σ = 611665532. Its totient is φ = 611665530.

The previous prime is 611665507. The next prime is 611665541. The reversal of 611665531 is 135566116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 611665531 - 2¹³ = 611657339 is a prime.

It is a super-2 number, since 2×611665531² = 748269443627023922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (611665501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305832765 + 305832766.

It is an arithmetic number, because the mean of its divisors is an integer number (305832766).

Almost surely, 2^611665531 is an apocalyptic number.

611665531 is a deficient number, since it is larger than the sum of its proper divisors (1).

611665531 is an equidigital number, since it uses as much as digits as its factorization.

611665531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 611665531 is about 24731.8727758332. The cubic root of 611665531 is about 848.8637787405.

The spelling of 611665531 in words is "six hundred eleven million, six hundred sixty-five thousand, five hundred thirty-one".