1972147154 has 4 divisors (see below), whose sum is σ = 2958220734. Its totient is φ = 986073576.

The previous prime is 1972147139. The next prime is 1972147187. The reversal of 1972147154 is 4517412791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1199029129 + 773118025 = 34627^2 + 27805^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493036787 + ... + 493036790.

Almost surely, 2^1972147154 is an apocalyptic number.

1972147154 is a deficient number, since it is larger than the sum of its proper divisors (986073580).

1972147154 is an equidigital number, since it uses as much as digits as its factorization.

1972147154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986073579.

The product of its digits is 70560, while the sum is 41.

The square root of 1972147154 is about 44408.8634621513. The cubic root of 1972147154 is about 1254.0449560655.

The spelling of 1972147154 in words is "one billion, nine hundred seventy-two million, one hundred forty-seven thousand, one hundred fifty-four".