61272531 has 20 divisors (see below), whose sum is σ = 91794472. Its totient is φ = 40730688.

The previous prime is 61272517. The next prime is 61272553. The reversal of 61272531 is 13527216.

It is a happy number.

61272531 is a `hidden beast` number, since 6 + 127 + 2 + 531 = 666.

It is not a de Polignac number, because 61272531 - 2⁹ = 61272019 is a prime.

It is a super-2 number, since 2×61272531² = 7508646110291922, which contains 22 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61272495 and 61272504.

It is not an unprimeable number, because it can be changed into a prime (61272571) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34200 + ... + 35946.

Almost surely, 2^61272531 is an apocalyptic number.

61272531 is a deficient number, since it is larger than the sum of its proper divisors (30521941).

61272531 is a wasteful number, since it uses less digits than its factorization.

61272531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192 (or 2183 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 61272531 is about 7827.6772416854. The cubic root of 61272531 is about 394.2350864984.

Adding to 61272531 its reverse (13527216), we get a palindrome (74799747).

The spelling of 61272531 in words is "sixty-one million, two hundred seventy-two thousand, five hundred thirty-one".