1651251402 has 48 divisors (see below), whose sum is σ = 3635528832. Its totient is φ = 541554720.

The previous prime is 1651251367. The next prime is 1651251403. The reversal of 1651251402 is 2041521561.

1651251402 is a `hidden beast` number, since 1 + 6 + 5 + 1 + 251 + 402 = 666.

It is not an unprimeable number, because it can be changed into a prime (1651251403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 825868 + ... + 827864.

It is an arithmetic number, because the mean of its divisors is an integer number (75740184).

Almost surely, 2^1651251402 is an apocalyptic number.

1651251402 is an abundant number, since it is smaller than the sum of its proper divisors (1984277430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1651251402 is a wasteful number, since it uses less digits than its factorization.

1651251402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723 (or 2720 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1651251402 is about 40635.5927974479. The cubic root of 1651251402 is about 1181.9644101045.

Adding to 1651251402 its reverse (2041521561), we get a palindrome (3692772963).

It can be divided in two parts, 1651251 and 402, that added together give a triangular number (1651653 = T₁₈₁₇).

The spelling of 1651251402 in words is "one billion, six hundred fifty-one million, two hundred fifty-one thousand, four hundred two".