651552061 has 4 divisors (see below), whose sum is σ = 651880000. Its totient is φ = 651224124.

The previous prime is 651552053. The next prime is 651552089. The reversal of 651552061 is 160255156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 651552061 - 2³ = 651552053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651522061) 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, 160971 + ... + 164968.

It is an arithmetic number, because the mean of its divisors is an integer number (162970000).

Almost surely, 2^651552061 is an apocalyptic number.

It is an amenable number.

651552061 is a deficient number, since it is larger than the sum of its proper divisors (327939).

651552061 is a wasteful number, since it uses less digits than its factorization.

651552061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327938.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 651552061 is about 25525.5178399969. The cubic root of 651552061 is about 866.9280218836.

The spelling of 651552061 in words is "six hundred fifty-one million, five hundred fifty-two thousand, sixty-one".