61351631 has 8 divisors (see below), whose sum is σ = 67544400. Its totient is φ = 55261440.

The previous prime is 61351613. The next prime is 61351639. The reversal of 61351631 is 13615316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61351631 - 2¹⁰ = 61350607 is a prime.

It is a super-2 number, since 2×61351631² = 7528045252720322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61351631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61351639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24386 + ... + 26783.

It is an arithmetic number, because the mean of its divisors is an integer number (8443050).

Almost surely, 2^61351631 is an apocalyptic number.

61351631 is a deficient number, since it is larger than the sum of its proper divisors (6192769).

61351631 is a wasteful number, since it uses less digits than its factorization.

61351631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51289.

The product of its digits is 1620, while the sum is 26.

The square root of 61351631 is about 7832.7281964843. The cubic root of 61351631 is about 394.4046599621.

Adding to 61351631 its reverse (13615316), we get a palindrome (74966947).

The spelling of 61351631 in words is "sixty-one million, three hundred fifty-one thousand, six hundred thirty-one".