1971625454 has 16 divisors (see below), whose sum is σ = 2966990208. Its totient is φ = 982635192.

The previous prime is 1971625429. The next prime is 1971625457. The reversal of 1971625454 is 4545261791.

It is a super-2 number, since 2×1971625454² = 7774613861721412232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971625457) 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, 1143437 + ... + 1145159.

It is an arithmetic number, because the mean of its divisors is an integer number (185436888).

Almost surely, 2^1971625454 is an apocalyptic number.

1971625454 is a deficient number, since it is larger than the sum of its proper divisors (995364754).

1971625454 is a wasteful number, since it uses less digits than its factorization.

1971625454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239.

The product of its digits is 302400, while the sum is 44.

The square root of 1971625454 is about 44402.9892462208. The cubic root of 1971625454 is about 1253.9343671320.

The spelling of 1971625454 in words is "one billion, nine hundred seventy-one million, six hundred twenty-five thousand, four hundred fifty-four".