651221454 has 16 divisors (see below), whose sum is σ = 1402630992. Its totient is φ = 200375808.

The previous prime is 651221453. The next prime is 651221479. The reversal of 651221454 is 454122156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651221453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4174419 + ... + 4174574.

It is an arithmetic number, because the mean of its divisors is an integer number (87664437).

Almost surely, 2^651221454 is an apocalyptic number.

651221454 is an abundant number, since it is smaller than the sum of its proper divisors (751409538).

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

651221454 is a wasteful number, since it uses less digits than its factorization.

651221454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8349011.

The product of its digits is 9600, while the sum is 30.

The square root of 651221454 is about 25519.0410086273. The cubic root of 651221454 is about 866.7813664432.

It can be divided in two parts, 6512 and 21454, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 651221454 in words is "six hundred fifty-one million, two hundred twenty-one thousand, four hundred fifty-four".