139092261 has 32 divisors (see below), whose sum is σ = 235032576. Its totient is φ = 71064000.

The previous prime is 139092259. The next prime is 139092269. The reversal of 139092261 is 162290931.

It is not a de Polignac number, because 139092261 - 2¹ = 139092259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139092269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9156 + ... + 19026.

It is an arithmetic number, because the mean of its divisors is an integer number (7344768).

Almost surely, 2^139092261 is an apocalyptic number.

139092261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

139092261 is a deficient number, since it is larger than the sum of its proper divisors (95940315).

139092261 is a wasteful number, since it uses less digits than its factorization.

139092261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9953.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 139092261 is about 11793.7382114408. The cubic root of 139092261 is about 518.1247308245.

The spelling of 139092261 in words is "one hundred thirty-nine million, ninety-two thousand, two hundred sixty-one".