261157939 has 16 divisors (see below), whose sum is σ = 312076800. Its totient is φ = 213681600.

The previous prime is 261157937. The next prime is 261157969. The reversal of 261157939 is 939751162.

It is a cyclic number.

It is not a de Polignac number, because 261157939 - 2¹ = 261157937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261157895 and 261157904.

It is not an unprimeable number, because it can be changed into a prime (261157931) 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, 95412 + ... + 98110.

It is an arithmetic number, because the mean of its divisors is an integer number (19504800).

Almost surely, 2^261157939 is an apocalyptic number.

261157939 is a deficient number, since it is larger than the sum of its proper divisors (50918861).

261157939 is a wasteful number, since it uses less digits than its factorization.

261157939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330.

The product of its digits is 102060, while the sum is 43.

The square root of 261157939 is about 16160.3817714805. The cubic root of 261157939 is about 639.1965332403.

The spelling of 261157939 in words is "two hundred sixty-one million, one hundred fifty-seven thousand, nine hundred thirty-nine".