61133391 has 12 divisors (see below), whose sum is σ = 96331560. Its totient is φ = 37050480.

The previous prime is 61133389. The next prime is 61133399. The reversal of 61133391 is 19333116.

It is not a de Polignac number, because 61133391 - 2¹ = 61133389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61133399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308656 + ... + 308853.

It is an arithmetic number, because the mean of its divisors is an integer number (8027630).

Almost surely, 2^61133391 is an apocalyptic number.

61133391 is a deficient number, since it is larger than the sum of its proper divisors (35198169).

61133391 is a wasteful number, since it uses less digits than its factorization.

61133391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617526 (or 617523 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 61133391 is about 7818.7844963268. The cubic root of 61133391 is about 393.9364456397.

The spelling of 61133391 in words is "sixty-one million, one hundred thirty-three thousand, three hundred ninety-one".