61353631 has 4 divisors (see below), whose sum is σ = 61381152. Its totient is φ = 61326112.

The previous prime is 61353613. The next prime is 61353637. The reversal of 61353631 is 13635316.

61353631 = T₆₃₉₄ + T₆₃₉₅ + T₆₃₉₆.

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-61353631 is a prime.

It is a super-2 number, since 2×61353631² = 7528536073768322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61353631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61353637) 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, 10090 + ... + 14983.

It is an arithmetic number, because the mean of its divisors is an integer number (15345288).

Almost surely, 2^61353631 is an apocalyptic number.

61353631 is the 6396-th centered triangular number.

61353631 is a deficient number, since it is larger than the sum of its proper divisors (27521).

61353631 is a wasteful number, since it uses less digits than its factorization.

61353631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27520.

The product of its digits is 4860, while the sum is 28.

The square root of 61353631 is about 7832.8558648810. The cubic root of 61353631 is about 394.4089456441.

Adding to 61353631 its reverse (13635316), we get a palindrome (74988947).

The spelling of 61353631 in words is "sixty-one million, three hundred fifty-three thousand, six hundred thirty-one".