1020621745 has 32 divisors (see below), whose sum is σ = 1445076864. Its totient is φ = 682214400.

The previous prime is 1020621743. The next prime is 1020621793. The reversal of 1020621745 is 5471260201.

It is not a de Polignac number, because 1020621745 - 2¹ = 1020621743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020621743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169354 + ... + 175276.

It is an arithmetic number, because the mean of its divisors is an integer number (45158652).

Almost surely, 2^1020621745 is an apocalyptic number.

It is an amenable number.

1020621745 is a deficient number, since it is larger than the sum of its proper divisors (424455119).

1020621745 is a wasteful number, since it uses less digits than its factorization.

1020621745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6193.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1020621745 is about 31947.1711580227. The cubic root of 1020621745 is about 1006.8271982902.

Adding to 1020621745 its reverse (5471260201), we get a palindrome (6491881946).

The spelling of 1020621745 in words is "one billion, twenty million, six hundred twenty-one thousand, seven hundred forty-five".