261075001 has 32 divisors (see below), whose sum is σ = 318318336. Its totient is φ = 211200000.

The previous prime is 261074999. The next prime is 261075037. The reversal of 261075001 is 100570162.

It is not a de Polignac number, because 261075001 - 2¹ = 261074999 is a prime.

It is a super-2 number, since 2×261075001² = 136320312294300002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261075041) 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, 434101 + ... + 434701.

It is an arithmetic number, because the mean of its divisors is an integer number (9947448).

Almost surely, 2^261075001 is an apocalyptic number.

It is an amenable number.

261075001 is a deficient number, since it is larger than the sum of its proper divisors (57243335).

261075001 is a wasteful number, since it uses less digits than its factorization.

261075001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 261075001 is about 16157.8154773472. The cubic root of 261075001 is about 639.1288611702.

The spelling of 261075001 in words is "two hundred sixty-one million, seventy-five thousand, one".