261274156 has 96 divisors (see below), whose sum is σ = 576700992. Its totient is φ = 101744640.

The previous prime is 261274151. The next prime is 261274217. The reversal of 261274156 is 651472162.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (261274151) 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, 943090 + ... + 943366.

It is an arithmetic number, because the mean of its divisors is an integer number (6007302).

Almost surely, 2^261274156 is an apocalyptic number.

261274156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

261274156 is an abundant number, since it is smaller than the sum of its proper divisors (315426836).

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

261274156 is a wasteful number, since it uses less digits than its factorization.

261274156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 417 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 261274156 is about 16163.9771096101. The cubic root of 261274156 is about 639.2913347327.

The spelling of 261274156 in words is "two hundred sixty-one million, two hundred seventy-four thousand, one hundred fifty-six".