61431345 has 16 divisors (see below), whose sum is σ = 109211520. Its totient is φ = 32763312.

The previous prime is 61431341. The next prime is 61431373. The reversal of 61431345 is 54313416.

61431345 is a `hidden beast` number, since 614 + 3 + 1 + 3 + 45 = 666.

It is not a de Polignac number, because 61431345 - 2² = 61431341 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (61431341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227389 + ... + 227658.

It is an arithmetic number, because the mean of its divisors is an integer number (6825720).

Almost surely, 2^61431345 is an apocalyptic number.

It is an amenable number.

61431345 is a deficient number, since it is larger than the sum of its proper divisors (47780175).

61431345 is a wasteful number, since it uses less digits than its factorization.

61431345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455061 (or 455055 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 61431345 is about 7837.8150654376. The cubic root of 61431345 is about 394.5754023201.

It can be divided in two parts, 61431 and 345, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 61431345 in words is "sixty-one million, four hundred thirty-one thousand, three hundred forty-five".