940661261 has 4 divisors (see below), whose sum is σ = 946652892. Its totient is φ = 934669632.

The previous prime is 940661251. The next prime is 940661263. The reversal of 940661261 is 162166049.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162166049 = 277 ⋅585437.

It can be written as a sum of positive squares in 2 ways, for example, as 132112036 + 808549225 = 11494^2 + 28435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-940661261 is a prime.

It is a super-2 number, since 2×940661261² = 1769687215892220242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (940661263) 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, 2995580 + ... + 2995893.

It is an arithmetic number, because the mean of its divisors is an integer number (236663223).

Almost surely, 2^940661261 is an apocalyptic number.

It is an amenable number.

940661261 is a deficient number, since it is larger than the sum of its proper divisors (5991631).

940661261 is a wasteful number, since it uses less digits than its factorization.

940661261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5991630.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 940661261 is about 30670.2015154775. The cubic root of 940661261 is about 979.8157577424.

The spelling of 940661261 in words is "nine hundred forty million, six hundred sixty-one thousand, two hundred sixty-one".