61609401 has 12 divisors (see below), whose sum is σ = 101704512. Its totient is φ = 35205336.

The previous prime is 61609399. The next prime is 61609409. The reversal of 61609401 is 10490616.

61609401 is a `hidden beast` number, since 616 + 0 + 9 + 40 + 1 = 666.

It is not a de Polignac number, because 61609401 - 2¹ = 61609399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61609409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 488901 + ... + 489026.

It is an arithmetic number, because the mean of its divisors is an integer number (8475376).

Almost surely, 2^61609401 is an apocalyptic number.

It is an amenable number.

61609401 is a deficient number, since it is larger than the sum of its proper divisors (40095111).

61609401 is a wasteful number, since it uses less digits than its factorization.

61609401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977940 (or 977937 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 61609401 is about 7849.1656244470. The cubic root of 61609401 is about 394.9562543019.

The spelling of 61609401 in words is "sixty-one million, six hundred nine thousand, four hundred one".