611402531 has 4 divisors (see below), whose sum is σ = 615063792. Its totient is φ = 607741272.

The previous prime is 611402503. The next prime is 611402551. The reversal of 611402531 is 135204116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611402531 is a prime.

It is a super-2 number, since 2×611402531² = 747626109826411922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 611402497 and 611402506.

It is not an unprimeable number, because it can be changed into a prime (611402551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1830380 + ... + 1830713.

It is an arithmetic number, because the mean of its divisors is an integer number (153765948).

Almost surely, 2^611402531 is an apocalyptic number.

611402531 is a deficient number, since it is larger than the sum of its proper divisors (3661261).

611402531 is a wasteful number, since it uses less digits than its factorization.

611402531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661260.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 611402531 is about 24726.5551785929. Note that the first 3 decimals coincide. The cubic root of 611402531 is about 848.7420983081.

Adding to 611402531 its reverse (135204116), we get a palindrome (746606647).

The spelling of 611402531 in words is "six hundred eleven million, four hundred two thousand, five hundred thirty-one".