261412019 has 4 divisors (see below), whose sum is σ = 285176760. Its totient is φ = 237647280.

The previous prime is 261412001. The next prime is 261412031. The reversal of 261412019 is 910214162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261412019 is a prime.

It is a super-2 number, since 2×261412019² = 136672487355312722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261412049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11882354 + ... + 11882375.

It is an arithmetic number, because the mean of its divisors is an integer number (71294190).

Almost surely, 2^261412019 is an apocalyptic number.

261412019 is a deficient number, since it is larger than the sum of its proper divisors (23764741).

261412019 is a wasteful number, since it uses less digits than its factorization.

261412019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23764740.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 261412019 is about 16168.2410607957. The cubic root of 261412019 is about 639.4037570321.

The spelling of 261412019 in words is "two hundred sixty-one million, four hundred twelve thousand, nineteen".