61909155 has 96 divisors (see below), whose sum is σ = 141792768. Its totient is φ = 24192000.

The previous prime is 61909153. The next prime is 61909157. The reversal of 61909155 is 55190916.

It is an interprime number because it is at equal distance from previous prime (61909153) and next prime (61909157).

It is not a de Polignac number, because 61909155 - 2¹ = 61909153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61909151) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 58380 + ... + 59430.

It is an arithmetic number, because the mean of its divisors is an integer number (1477008).

Almost surely, 2^61909155 is an apocalyptic number.

61909155 is an abundant number, since it is smaller than the sum of its proper divisors (79883613).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61909155 is a wasteful number, since it uses less digits than its factorization.

61909155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 61909155 is about 7868.2370960718. The cubic root of 61909155 is about 395.5957575176.

The spelling of 61909155 in words is "sixty-one million, nine hundred nine thousand, one hundred fifty-five".