61631455 has 16 divisors (see below), whose sum is σ = 76936320. Its totient is φ = 47354112.

The previous prime is 61631431. The next prime is 61631473. The reversal of 61631455 is 55413616.

It is a cyclic number.

It is not a de Polignac number, because 61631455 - 2⁷ = 61631327 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12507 + ... + 16723.

It is an arithmetic number, because the mean of its divisors is an integer number (4808520).

Almost surely, 2^61631455 is an apocalyptic number.

61631455 is a deficient number, since it is larger than the sum of its proper divisors (15304865).

61631455 is a wasteful number, since it uses less digits than its factorization.

61631455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338.

The product of its digits is 10800, while the sum is 31.

The square root of 61631455 is about 7850.5703614451. The cubic root of 61631455 is about 395.0033754986.

The spelling of 61631455 in words is "sixty-one million, six hundred thirty-one thousand, four hundred fifty-five".